EX fighters
Defeat an EX character in survival mode, Then, hold
[L2] when choosing that fighter at the character selection
screen to play as the EX version. Alternately, successfully complete
30 missions.
SP fighters
Defeat an SP character in survival mode. Then, hold
[L1] when choosing that fighter at the character selection
screen to play as the SP version. Alternately, successfully complete
80 missions.
Gold & Shadow Mode
During character selection screen, Hit the Left Trigger 3 times, on the third time, HOLD IT DOWN and press the following buttons:
[R] - Gold Mode (faster and stronger)
[Start] - Shadow Mode (nothing really)
Fight against gold fighters
Highlight the "Arcade" or "M.O.M." mode options, then hold [L1] while selecting it. You will fight against gold opponents in that mode.
Fight against EX fighters
Highlight the "Arcade" or "M.O.M." mode options, then hold [L2] while selecting it. You will fight against EX opponents in that mode.
Fight against gold EX fighters
Highlight the "Arcade" or "M.O.M." mode options, then hold [L1] + [L2] while selecting it. You will fight against EX opponents in that mode.